U.S. patent application number 10/614811 was filed with the patent office on 2004-01-22 for hair dye compositions.
This patent application is currently assigned to Kao Corporation. Invention is credited to Hori, Takashi, Ogawa, Masahiko.
Application Number | 20040010865 10/614811 |
Document ID | / |
Family ID | 18360867 |
Filed Date | 2004-01-22 |
United States Patent
Application |
20040010865 |
Kind Code |
A1 |
Ogawa, Masahiko ; et
al. |
January 22, 2004 |
Hair dye compositions
Abstract
Hair dye compositions comprise (A) ammonia or an ammonium salt,
(B) a carbonate (other than an ammonium salt), (C) a transition
metal salt, and (D) a chelating agent, and have a pH of from 8.5 to
12. They do not give off an intensely irritating odor and have low
irritating property, can change hair into a lighter tone in a short
time or can dye hair well in a color ranging from a light color to
a deep color, and moreover, assure good retention of the
thus-obtained tone or color.
Inventors: |
Ogawa, Masahiko; (Tokyo,
JP) ; Hori, Takashi; (Tokyo, JP) |
Correspondence
Address: |
OBLON, SPIVAK, MCCLELLAND, MAIER & NEUSTADT, P.C.
1940 DUKE STREET
ALEXANDRIA
VA
22314
US
|
Assignee: |
Kao Corporation
14-10 Nihonbashikayabacho 1-chome Chuo-ku
Tokyo
JP
103-8210
|
Family ID: |
18360867 |
Appl. No.: |
10/614811 |
Filed: |
July 9, 2003 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10614811 |
Jul 9, 2003 |
|
|
|
09722483 |
Nov 28, 2000 |
|
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Current U.S.
Class: |
8/405 ;
8/406 |
Current CPC
Class: |
A61Q 5/065 20130101;
A61K 8/44 20130101; A61K 2800/75 20130101; A61K 8/19 20130101; A61K
2800/51 20130101 |
Class at
Publication: |
8/405 ;
8/406 |
International
Class: |
A61K 007/13 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 2, 1999 |
JP |
11-343352 |
Claims
1. A hair dye composition comprising the following ingredients (A)
to (D):
6 (A) ammonia or an ammonium salt 0.01 to 3 mol/kg, (B) a carbonate
with a proviso 0.001 to 1 mol/kg, that said carbonate is other than
an ammonium salt (C) a transition metal salt 0.1 to 10,000 ppm, (D)
a chelating agent
the molar ratio of (A) to (B) [(A)/(B)] being 0.1 to 5, and said
hair dye composition having a pH of from 8.5 to 12.
2. A hair dye composition according to claim 1, wherein the content
of said ingredient (D) is 0.01 to 10 wt. % based on said
composition.
3. A method of dyeing the hair, comprising: mixing a first pack
formulation and a second pack formulation, said first pack
formulation comprising the following ingredients (A) to (D):
7 (A) ammonia or an ammonium salt 0.1 to 1 mol/kg, (B) a carbonate
with the proviso that 0.001 to 1 mol/kg, said carbonate is other
than an ammonium salt, (C) a water soluble salt of iron, 0.1 to
10,000 ppm,
(D) a chelating agent, wherein the molar ratio of (A) to (B) ranges
from 0.1 to 5, and the first pack formulation has a pH ranging from
8.5 to 12; and said second pack comprising hydrogen peroxide as an
oxidizing agent; applying the mixed first and second pack
formulations to the hair; permitting the applied mixed formulation
to dye the hair; and then removing the applied mixed formulation
from the hair.
4. The method of dyeing hair of claim 3, wherein the second pack
formulation contains about 6 wt% hydrogen peroxide.
5. The method of dyeing hair of claim 3, wherein the hair is dyed
at a temperature ranging from about 15 to 40.degree. C. for about 1
to 50 minutes.
6. The method of dyeing hair of claim 3, wherein the hair is dyed
at a temperature ranging from about 10 to 30 minutes.
7. The method of dyeing hair of claim 3, wherein the applied
formulation is removed from the hair by washing the hair.
8. The method of dyeing hair of claim 3, wherein the content of
said ingredient (D) in the first pack formulation is 0.01 to 10 wt%
based on said composition.
9. The method of dyeing hair of claim 3, wherein said water soluble
salt of iron is ferrous sulfate or ferrous chloride.
10. The method of dyeing hair of claim 3, wherein the chelating
agent (D) is ethylenediaminetetraacetic acid,
hydroyethylethylenediaminetriacetic acid,
diethylenetriaminepentaacetic acid, nitrilotriacetic acid,
triethylenetetraminehexaacetic acid, a phosphonic acid,
tripolyphosphoric acid, ascorbic acid, citric acid, maleic acid or
salts thereof.
11. The method of dyeing hair of claim 3, wherein said carbonate
(B) of the first pack formulation is sodium carbonate, sodium
hydrogencarbonate, potassium carbonate, potassium
hydrogencarbonate, guanidine carbonate, guanidine
hydrogencarbonate, lithium carbonate, calcium carbonate, magnesium
carbonate or barium carbonate.
12. The method of dyeing hair of claim 3, wherein said pH ranges
from 9to 11.5
13. The method of dyeing hair of claim 3, wherein the amount of
said carbonate in the composition ranges from 0.01 to 0.5
mol/kg.
14. The method of dyeing hair of claim 3, wherein said molar ratio
of (A) to (B) ranges from 0.2 to 3.
Description
TECHNICAL FIELD
[0001] This invention relates to hair dye compositions, each of
which does not give off an intensely irritating odor and has low
irritating property, can change hair into a lighter tone in a short
time or can dye hair well in a color ranging from a light color to
a deep color, and moreover, assures good retention of the
thus-obtained tone or color.
BACKGROUND ART
[0002] In recent years, there is an increasing demand from
consumers toward dyeing their hair in a lighter color than their
own haircolor (starting haircolor), and many products generally
called "fashion hair dyes" are available on the market.
[0003] Hair dyes, which are used for such purposes and include hair
bleaches, are each composed of a first pack containing an alkali
agent and a second pack containing an oxidizing agent. The alkali
agent employed in the first pack has been added to heighten
bleaching or dyeing effect and to obtain a wide range of colors
ranging from a light color to a deep color. In particular, when one
wants to change his or her hair into a tone lighter than the tone
of his or her own haircolor, sufficient bleaching power is
required. When a hair dye is used for such purposes, a fully
sufficient amount of an alkali is therefore required. To dye hair
well with good color retention, a sufficient amount of an alkali is
also required.
[0004] Conventionally, ammonia has been used as an alkali agent in
general. Ammonia is, however, accompanied by drawbacks that it has
an intensely irritating odor and makes consumers feel unpleasant
upon dyeing.
[0005] Transition metals have, therefore, been used in attempts to
accelerate a reaction with an oxidizing agent and hence to heighten
bleaching power or dyeing power (for example, JP 4-312514 A,
JP5-124940A, JP6-87727A, and JP4-312514). These attempts, however,
all require further treatment with a hair dye after hair is left
over with a metal-ion-containing preparation applied thereon
beforehand. They thus involves a problem of irksomeness, and
moreover, they neither have sufficient dyeing ability nor assure
satisfactory color retention.
[0006] It has also been attempted to incorporate transition metal
ions in first packs (for example, JP 61-130209 A and JP 6-65643 B).
However, such first packs are all used under neutral to weak
alkaline conditions of pH 6 to pH 8.5, and accordingly, their
alkali contents are not sufficient. No sufficient bleaching power
is thus available from them, leading to failure in dyeing hair in a
light color. These attempts also involve a problem that a dyed
color does not stay long.
[0007] An object of the present invention is to provide a hair dye
composition, which does not give off an intensely irritating odor
and has low irritating property, can change hair into a lighter
tone in a short time or can dye hair well in a color ranging from a
light color to a deep color, and moreover, assures good retention
of the thus-obtained tone or color.
DISCLOSURE OF THE INVENTION
[0008] The present inventors have found that combined use of
ammonia or an ammonium salt, a carbonate, a transition metal salt
and a chelating agent in specific proportions can provide a hair
dye composition which is reduced in the irritating odor of ammonia
and is free of the above-described problems.
[0009] The present invention, therefore, provides a hair dye
composition comprising the following ingredients (A) to (D):
1 (A) ammonia or an ammonium salt 0.01 to 3 mol/kg, (B) a carbonate
with a proviso 0.001 to 1 mol/kg, that said carbonate is other than
an ammonium salt (C) a transition metal salt 0.1 to 10,000 ppm, (D)
a chelating agent
[0010] the molar ratio of (A) to (B) [(A)/(B)] being 0.1 to 5, and
said hair dye composition having a pH of from 8.5 to 12.
BEST MODES FOR CARRYING OUT THE INVENTION
[0011] Preferred examples of the ammonium salt as the ingredient
(A) can include ammonium chloride, ammonium sulfate, ammonium
nitrate, ammonium carbonate, ammonium hydrogencarbonate, ammonium
phosphate, and ammonium carbonate, among which ammonium chloride,
ammonium carbonate and ammonium hydrogencarbonate are particularly
preferred.
[0012] As the ingredient (A), ammonia and an ammonium salt may be
used in combination, and their total content is 0.01 to 3 mol/kg in
the composition according to the present invention from the
standpoint of tone and color retention, with 0.1 to 1 mol/kg,
especially 0.15 to 0.6 mol/kg being preferred.
[0013] Examples of the carbonate as the ingredient (B) can include
carbonates and hydrogencarbonates, with the proviso that ammonia
salts are excluded. Illustrative are sodium carbonate, sodium
hydrogencarbonate, potassium carbonate, potassium
hydrogencarbonate, guanidine carbonate, guanidine
hydrogencarbonate, lithium carbonate, calcium carbonate, magnesium
carbonate, and barium carbonate. Of these, potassium carbonate and
guanidine carbonate are particularly preferred.
[0014] The content of the ingredient (B) is 0.001 to 1 mol/kg in
the composition according to the present invention from the
standpoint of bleaching performance and irritation to the scalp,
with 0.01 to 0.5 mol/kg, especially 0.05 to 0.3 mol/kg being
particularly preferred.
[0015] Further, the molar ratio of (A) to (B) [(A)/(B)] is 0.1 to 5
from the standpoint of irritating odor and bleaching performance,
with 0.2 to 3, especially 0.3 to 1.5 being preferred.
[0016] The transition metal salt as the ingredient (C) may be a
water-soluble salt of a transition metal. Illustrative of such a
water-soluble salt are the hydrochlorides, sulfates, nitrates,
phosphates and organic acid salts of metals such as iron, copper,
zinc, cobalt, nickel, manganese, and silver. Among these,
water-soluble salts of iron, for example, ferrous sulfate and
ferrous chloride are particularly preferred.
[0017] The transition metal salt as the ingredient (C) is
incorporated in the composition according to the present invention
such that the content of transition metal ions becomes 0.1 to
10,000 ppm, with an ion content of from 1 to 100 ppm being
particularly preferred.
[0018] No particular limitation is imposed on the chelating agent
as the ingredient (D) insofar as it has ability to chelate metal
ions in the ingredient (C) and is commonly used in cosmetic
preparations. Illustrative are ethylenediaminetetraacetic acid,
hydroethylethylenediami- netriacetic acid,
diethylene-triaminepentaacetic acid, nitrilotriacetic acid,
triethylenetetraminehexaacetic acid, phosphonic acids,
tripolyphosphoric acid, ascorbic acid, citric acid, maleic acid,
and salts thereof. Of these, ethylenediaminetetraacetic acid is
particularly preferred.
[0019] The chelating agent as the ingredient (D) may be
incorporated preferably in a proportion of from0.01 to10 wt.%,
especially from 0.1 to 1.0 wt.% in the composition according to the
present invention.
[0020] The pH of the hair dye composition according to the present
invention is adjusted to 8.5 to12, preferably 9to11.5, notably 10
to 11. The term "pH" as used herein means a pH value of a hair dye
concentrate as measured, as is, without dilution.
[0021] The pH adjustment is effected in a manner known per se in
the art by using an alkali agent or acid other than those described
above. Usable examples of the alkali agent can include
alkanolamines such as monoethanolamine, diethanol-amine,
triethanolamine, monopropanolamine, dipropanolamine,
tripropanolamine, 2-amino-2-methyl-1,3-propanediol,
2-amino-2-methyl-1-propanol, and
2-amino-2-hydroxymethyl-1,3-propanediol; and guanidium salts such
as guanidine hydrochloride, guanidine sulfate, guanidine nitrate,
guanidine phosphate, guanidine thiophosphate, guanidine borate,
guanidine sulfamate, and the guanidine salts of organic acids.
[0022] Here, combined use of an alkanolamine (ingredient E) as the
alkali agent is preferred for heightening dyeing power or bleaching
agent.
[0023] The hair dye composition according to the present invention
may contain oxidation dye intermediate or as in the case of
so-called "hair bleaches", may not contain such an oxidation dye
intermediate. It should be noted that they are both encompassed in
the present invention. When the oxidation dye intermediate is used,
it is added to a first dye pack. As the oxidative dye intermediate,
a color-developing substance and a coupling substance are
added.
[0024] No particular limitation is imposed on the color-developing
substance insofar as it is commonly used in oxidative hair dyes.
Examples of the color-developing substance can include
p-phenylenediamines having one or more H.sub.2N-groups, RHN-groups
or (R).sub.2N-groups in which each R represents an alkyl or
hydroxyalkyl group having 1 to 4 carbon atoms, such as
p-phenylenediamine, p-toluylenediamine,
N-methyl-p-phenylene-diamine, N,N-dimethyl-p-phenylenediamine,
N,N-diethyl-2-methyl-p-phenylenediamine,
N-ethyl-N-(hydroxyethyl)-p-pheny- lenediamine,
chloro-p-phenylenediamine, 2-(2'-hydroxy-ethylamino)-5-aminot-
oluene, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine,
methoxy-p-phenylenediamine, 2,6-dichloro-p-phenylenediamine,
2-chloro-6-bromo-p-phenylenediamine,
2-chloro-6-methyl-p-phenylenediamine- ,
6-methoxy-3-methyl-p-phenylenediamine, 2,5-diaminoanisole,
N-(2-hydroxypropyl)-p-phenylenediamine, and
N-2-methoxyethyl-p-phenylened- iamine; and p-aminophenols,
o-aminophenols and o-phenylenediamines, such as p-aminophenol,
2-methyl-4-aminophenol, 3-methyl-4-aminophenol,
2-chloro-4-aminophenol, 3-chloro-4-aminophenol,
2,6-dimethyl-4-aminopheno- l, 3,5-dimethyl-4-aminophenol,
2,3-dimethyl-4-aminophenol, 2,5-dimethyl-4-aminophenol, and
2,4-diaminophenol, 5-aminosalicylic acid.
[0025] On the other hand, examples of the coupling substance can
include a-naphthol, o-cresol, m-cresol, 2,6-dimethylphenol,
2,5-dimethylphenol, 3,4-dimethylphenol, 3,5-dimethylphenol,
benzcatechin, pyrogallol, 1,5-dihydroxynaphthalene,
1,7-dihydroxynaphthalene, 5-amino-2-methylphenol,
5-(2'-hydroxyethylamino)-4-methoxyphenol, hydroquinone,
2,4-diaminoanisole, m-toluylenediamine, 4-aminophenol, resorcin,
resorcin monomethyl ether, m-phenylenediamine,
1-phenyl-3-methyl-5-pyrazolone, 1-phenyl-3-amino-5-pyrazolone,
1-phenyl-3,5-diketo-pyrazolidine,
1-methyl-7-dimethylamino-4-hydroxy-2-qu- inolone, m-aminophenol,
4-chlororesorcin, 2-methylresorcin, 2,4-diaminophenoxyethanol,
2,6-diamino-pyridine, 3,5-diaminotrifluorometh- ylbenzene,
2,4-diamino-fluorobenzene, 3,5-diaminofluorobenzene,
2,4-diamino-6-hydroxypyrimidine, 2,4,6-triaminopyrimidine,
2-amino-4,6-dihydroxypyrimidine, 4-amino-2,6-dihydroxypyrimidine,
and 4,6-diamino-2-hydroxypyrimidine.
[0026] These color-developing substances may be used either singly
or in combination. Likewise, these coupling substances may also be
used either singly or in combination. It is preferred to
incorporate such color-developing substance or substances and such
coupling substance or substances, each, in a total proportion of
from 0.01 to 20 wt. %, especially from 0.5 to 10 wt. % in the hair
dye composition according to the present invention. Further, a
direct dye may also be incorporated in the first dye pack to
additionally tune the color.
[0027] As also described above, the composition according to the
present invention may be formulated as a first bleach pack without
adding such an oxidation dye intermediate.
[0028] When formulated as a first dye pack or a first bleach pack,
it is preferred to mix it with an oxidizing agent upon use.
Illustrative of the oxidizing agent are hydrogen peroxide, an
adduct of hydrogen peroxide with urea, melamine or sodiumborate,
and a mixture of such a hydrogen peroxide adduct and potassium
peroxidedisulfate.
[0029] Upon use, the first dye pack or the first bleach pack is
generally mixed with a liquid or cream-like oxidizing agent
composition (second pack), which contains about 6 wt. % of hydrogen
peroxide, at 1:1 to 1:3 (by weight ratio), the mixture so prepared
is applied to hair at a temperature of from 15 to 40.degree. C.,
and after the hair is left over for 1 to 50 minutes, preferably
from 10 to 30 minutes, the mixture is washed off.
[0030] It is preferred to additionally incorporate an antioxidant
such as a nitrite or a salt of thioglycolic acid in the composition
according to the present invention.
[0031] It is also possible to add, as needed, ingredients employed
in general cosmetic preparations, for example, viscosity/gel
strength modifiers, oils and fats, waxes, hydrocarbons, polyhydric
alcohols, esters, amides, silicone derivatives, cationic
surfactants, anionic surfactants, amphoteric surfactants, nonionic
surfactants, nonionic polymers, anionic polymers, amphoteric
polymers, protein derivatives, amino acids, preservatives,
stabilizers, plant extracts, crude drug extracts, vitamins,
colorants, perfumes, pigments, ultraviolet absorbers and the
like.
[0032] The composition according to the present invention can be
prepared in a manner known per se in the art, and as its
preparation form, can be formulated into a clear lotion, an
emulsion, a cream, a gel, a paste, or a mouss. Example 1 and
Comparative Examples 1-2.
[0033] In each of these example and comparative examples, a first
dye pack of the corresponding formulation shown in Table 1 and a
second pack of the formulation presented in Table 2 were prepared,
and were ranked as to irritating odor, irritation to the scalp,
dyeability, color retention and lightness. The results are also
shown in Table 1.
[0034] (Ranking methods)
[0035] (1) Irritating odor
[0036] The second pack was added to and mixed with the first pack
in equal amounts (by weight). An odor of the mixture was ranked in
accordance with the following standard:
[0037] A: No substantial irritating odor was felt.
[0038] B: A slight irritating odor was felt.
[0039] C: A strong irritating odor was felt.
[0040] (2) Irritation to scalp
[0041] An equiamount mixture of the first pack and the second pack
was applied to the scalp, and irritation to the scalp was then
ranked in accordance with the following standard:
[0042] A: No substantial irritation was felt.
[0043] B: Slight irritation was felt.
[0044] C: Strong irritation was felt.
[0045] (3) Dyeability
[0046] An equiamount mixture of the first pack and the second pack
was applied to a white tress, and after the white tress was allowed
to stand at 30.degree. C. for 15 minutes, the white tress was
rinsed and shampooed and then dried. The dyeability of the tress
was visually ranked in accordance with the following standard:
[0047] A: Dyed even and well.
[0048] B: Not dyed well, or dyed somewhat uneven.
[0049] C: Practically not dyed, or dyed uneven.
[0050] (4) Color retention
[0051] After the white tress dyed in the above test (3) was
repeatedly washed 20 times with a commercial shampoo, the white
tress was visually ranked in accordance with the following
standard:
[0052] A: No substantial difference was observed from the tress
before the shampooing.
[0053] B: Some fading was observed in comparison with the tress
before the shampooing.
[0054] C: Substantial fading was observed in comparison with the
tress before the shampooing.
[0055] (5) Lightness
[0056] Using a black tress, dyeing was performed in a similar
manner as in the test (3). The lightness of the tress was visually
ranked in accordance with the following standard:
[0057] A: Dyed in a natural, light, chestnut color.
[0058] B: Dyed in a somewhat dark brown color.
[0059] C: Dyed in a dark black-brown color.
2 TABLE 1 Ex. Comp. Ex. Ingredient (wt. %) 1 1 2 Aqueous ammonia
(28%) 0.5 0.5 0.5 Ammonium chloride 0.5 0.5 0.5 Ferrous sulfate 15
15 -- ppm ppm Tetrasodium ethylenediamine- 0.1 -- 0.1 tetraaceate
Monoethanolamine 3.5 3.5 3.5 Potassium carbonate 2.5 2.5 2.5
Toluene-2,5-diamine 1.0 1.0 1.0 Resorcin 0.4 0.4 0.4
Metaaminophenol 0.2 0.2 0.2 Cetanol 6 6 6 Octyldodecanol 1 1 1
Polyoxyethylene (40) cetyl ether 3.0 3.0 3.0 Polyoxyethylene (2)
cetyl ether 3.5 3.5 3.5 Liquid paraffin 1.0 1.0 1.0 Propylene
glycol 6.0 6.0 6.0 Sodium sulfite 0.5 0.5 0.5 Ascorbic acid 0.5 0.5
0.5 Perfume 0.3 0.3 0.3 Hydrochloric acid Sufficient to adjust pH
to 10.5 Water Balance Content of ingredient (A) (mol/kg) 0.175
0.175 0.175 Content of ingredient (B) (mol/kg) 0.181 0.181 0.181
(A)/(B) (molar ratio) 0.967 0.967 0.967 Ranked Irritating odor A A
A Property Irritation to the scalp A A A Dyeability A B B Color
retention A C C Lightness A C C
[0060]
3 TABLE 2 Ingredient Added amount (wt. %) Hydrogen peroxide (35%)
17.1 Methylparaben 0.1 Phosphoric acid Sufficient to adjust pH to
3.5 Water Balance
EXAMPLE 2
[0061] A first dye pack of the formulation shown in Table 3 was
prepared in a manner known per se in the art.
[0062] To the thus-obtained first pack, a second pack of the
formulation shown above in Table 2 was added in an equal amount (by
weight). In a manner similar to Example 1, the resulting mixture
was ranked as to irritating odor, irritation to the scalp,
dyeability, color retention and lightness. Those properties were
all ranked "A".
4 TABLE 3 Added amount Ingredient (wt. %) Aqueous ammonia (28%) 1.0
Ammonium hydrogencarbonate 1.3 Ferrous sulfate 20 ppm Tetrasodium
ethylenediaminetetraaceate 0.2 Monoethanolamine 3.0
Monoethanolamine hydrochloride 1.2 solution (60%) Potassium
carbonate 2.0 Toluene-2,5-diamine 1.5 Resorcin 0.6 Metaaminophenol
0.3 Oleic acid 10.0 Diethanolamide oleate 8.0 Polyoxyethylene (20)
octyldodecyl ether 10.0 Ethanol 15.0 Propylene glycol 10.0 Sodium
sulfite 0.5 Ascorbic acid 0.5 Perfume 0.3 Hydrochloric acid
Sufficient to adjust pH to 11.0 Water Balance Content of ingredient
(A) (mol/kg) 0.33 Content of ingredient (B) (mol/kg) 0.145 (A)/(B)
(molar ratio) 2.28
EXAMPLE 3
[0063] A first bleach pack of the formulation shown in Table 4 was
prepared in a manner known per se in the art.
[0064] To the thus-obtained first pack, a second pack of the
formulation shown above in Table 2 was added in an equal amount (by
weight). In a manner similar to Example 1, the resulting mixture
was ranked as to irritating odor, irritation to the scalp, and
lightness. Those properties were all ranked "A".
5 TABLE 4 Added amount Ingredient (wt. %) Aqueous ammonia (28%) 2.5
Guanidine carbonate 2.0 Ferrous sulfate 30 ppm Tetrasodium
ethylenediaminetetraaceate 0.3 Monoethanolamine 2.5 Oleic acid 10.0
Diethanolamide oleate 8.0 Polyoxyethylene (20) octyldodecyl ether
10.0 Ethanol 15.0 Propylene glycol 10.0 Sodium sulfite 0.5 Ascorbic
acid 0.5 Perfume 0.3 Sodium hydrogencarbonate Sufficient to adjust
pH to 11.0 Water Balance Content of ingredient (A) (mol/kg) 0.412
Content of ingredient (B) (mol/kg) 0.165 (A)/(B) (molar ratio)
2.50
Industrial Applicability
[0065] The hair dye compositions according to the present 5
invention do not give off an intensely irritating odor and have low
irritating property, can change hair into a lighter tone in a short
time or can dye hair well in a color ranging from a light color to
a deep color, and moreover, assures good retention of the
thus-obtained tone or color. They are suitable as first dye packs
or first bleach packs.
* * * * *